Specifications

5
50M56
TERMINAL
TERMINAL
TYPE
SYSTEM COMPONENT
CONNECTION
TYPICAL SYSTEM WIRING TABLE
†
Maximum recommended flame probe wire length is 36 inches.
low voltage thermostat W terminal (or equivalent)
low voltage thermostat G terminal (or equivalent)
low voltage thermostat R terminal (or equivalent)
low voltage thermostat Y terminal (or equivalent)
(2nd wire from Y terminal goes to 24 VAC HOT side of
compressor contactor coil)
24 VAC COMMON side of compressor contactor coil
high limit and flame rollout OUTPUT
gas valve first stage
24 VAC transformer (low voltage HIGH side)
pressure switch and low gas pressure switch OUTPUT
Not used
24 VAC transformer (low voltage COMMON side)
high limit and flame rollout INPUT
MUST BE RELIABLY GROUNDED TO CHASSIS
gas valve COMMON
pressure switch / low gas pressure switch INPUT
and optional 24V HUM
Not used
Not used
inducer HOT side
ignitor HOT side
inducer NEUTRAL side (or 1/4” Line Neutral)
ignitor NEUTRAL side (or 1/4” Line Neutral)
W
G
R
Y
C
HLO (Pin 1)
MV LO (Pin 2)
TH (Pin 3)
PSO (Pin 4)
Not used (Pin 5)
TR (Pin 6)
HLI (Pin 7)
GND (Pin 8)
MV COM (Pin 9)
PSI (Pin 10)
Not used (Pin 11)
Not used (Pin 12)
IND (Pin 1)
IGN (Pin 2)
IND-N (Pin 3)
IGN-N (Pin 4)
COOL
LO HEAT
HI HEAT
PARK (2 terminals)
LINE
XFMR
EAC (optional)
HUM (optional)
CIR N
LINE N
XFMR N
EAC N (optional)
HUM N (optional)
FS
circulator blower COOL SPEED terminal
circulator blower continuous FAN terminal
circulator blower HI HEAT SPEED terminal
unused terminals
input voltage (120 VAC) HOT side
24 VAC transformer line voltage HOT side
electronic air cleaner HOT side
humidifier HOT side (120 V)
circulator blower NEUTRAL terminal
input voltage (120 VAC) NEUTRAL side
24 VAC transformer line voltage NEUTRAL side
electronic air cleaner NEUTRAL side
humidifier NEUTRAL side
flame sensor probe
†
HLO
PSO
HLI
PSI
GND
TH
TR
MV
LO
511
12
MV
COM
IND
IGN
IND
N
IGN
N
Te rminal
block with
captive
screws
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
spade terminal
Twinning: The control board in this kit CANNOT be twinned with any of the Carrier circuit boards.
WIRING DIAGRAM